Blues Deluxe to ODS #183 Thread

[pompeiisneaks]

//Seriously off topic
I have nothing but praise for DaVinci Resolve, Phil Restored my faith in video editing after so many years. I even splurged for the studio version and can’t be happier.

Kudos for the videos - so entertaining and useful watch.

Niki

I have had nothing but crashes since 16.0 came out and 16.1 was worse. I guess for me a company that calls a release as official (and not beta) that won't run, is a warning sign to me ;D

I spent a long time trying to learn the software, didn't get it yet, after several years of on and off tinkering, and this latest update was the end of it for me.

BUT your mileage obviously varies

Thanks for the comments on the video!

~Phil

Premiere Pro.. or the Elements version? for most people the elements version is plenty good enough.


M

The full version, using my daughters 'in college' status to pay for it under her name, and use it for 21$ a month for the entire creative cloud account

~Phil

[norburybrook]

I have had nothing but crashes since 16.0 came out and 16.1 was worse. I guess for me a company that calls a release as official (and not beta) that won't run, is a warning sign to me ;D

I spent a long time trying to learn the software, didn't get it yet, after several years of on and off tinkering, and this latest update was the end of it for me.

BUT your mileage obviously varies

Thanks for the comments on the video!

~Phil

Premiere Pro.. or the Elements version? for most people the elements version is plenty good enough.


M

The full version, using my daughters 'in college' status to pay for it under her name, and use it for 21$ a month for the entire creative cloud account

~Phil

that's great value if you use the whole package etc I htink if you're just video editing on a smaller scale i.e. not commercial feature films then the $80 Premier Elements is amazing value too.

Anyway...keep up the good work

M

[pompeiisneaks]

that's great value if you use the whole package etc I htink if you're just video editing on a smaller scale i.e. not commercial feature films then the $80 Premier Elements is amazing value too.

Anyway...keep up the good work

M

That's a good idea when she finally finishes school

~Phil

[pompeiisneaks]

Ok so I fired her up today, and boy does the clean sound great! I need to figure out the bias though, from my B+ voltage of 424VDC, the bias calculator on robrob's site says I should be around 38mA but my pot can't get me lower than about 51mA on one side and 47mA on the other (well mV with the 1ohm resistor, so that means I can subtract out the about 5mA of current for the non anode current, but still).

I think it sounds fine, and the tubes aren't redplating but I'm guessing I need to bring that down a bit more. Which is the best resistor to change. Here's the schematic bias circuit.

Bias.png

I'm thinking the R59 could be higher maybe? 22k instead to raise the negative voltage a touch? (am I thinking about that right? As I recall the higher the negative bias, the colder the bias is... right?, which means to get a higher negative bias you want more resistance in the ground side?)

Other than that I have no complaints on the clean side.

OD channel, if the trim is up a bit, and not even that much, i seem to be getting oscillation. Partly based on how much nosie I have in the room I think, with LED's all around, (LED's in the ceiling as well as the LED Light panel I'm using for filming). When I dialed it down to where I seem to lose that oscillation, the drive seems nice and really crunchy, but I'm not sure if that's 'expected' or if there are common things to check for oscillations?

Other than that, when i do have it in, it sounds excellent as well, I do think it would be good to have a bit more drive on tap, but I don't "need" it

I'll have to play with the HRM tone stack a bit, and I need to balance the PI and dial in the right bias and I think I'll be golden.

Audio and video clips to come, after I finish editing all the others. (but I may give a sneak peek here for the forum members)

~Phil

[martin manning]

For 5881 (23W Pa max) at 424V on the plates and 70%, I would target 23*0.7/424 = 38mA. Yes, increasing R59 is the way to go, and 22k sounds like a good guess.

[JazzGuitarGimp]

Hi Phil,

Yes, increase R59. Aaron discovered for 6L6’s, he needed to increase R59 to 100K. I might suggest you do the same if you think the amp may wind up with 6L6’s in the future. This won’t have a negative effect on the other end of the pot’s rotation (closer to ground).

Edit: Scratch that last, non-sensical sentence.

Cheers,
Lou

[pompeiisneaks]

Hi Phil,

Yes, increase R59. Aaron discovered for 6L6’s, he needed to increase R59 to 100K. I might suggest you do the same if you think the amp may wind up with 6L6’s in the future. This won’t have a negative effect on the other end of the pot’s rotation (closer to ground).

Cheers,
Lou

Oh good point, yeah I might put in some 6L6's at some point, thanks to both of you!

So is the oscillation type noise something that you just dial the gain down on the od pot on the board until it's gone or? I swapped tubes and it got better too, but it still happens at higher gain levels and higher pot value.

~Phil

[JazzGuitarGimp]

Hi Phil,

I’d say if you can dial out the oscillation that way, and still love the OD tone, you’re gold. Did you start with the pot set to where the note on the schematic says (from memory, I want to say this is 27K, and is measured from the pot’s wiper to ground with the power off). I believe this is where the pot in the original, donor amp was set, and should at least get you in the ballpark.

Cheers,
Lou

[pompeiisneaks]

I set it based on my ear. I dialed it down until the OD was silent, then started dialing it up with drive and drive volume at max until it was getting too nasty, then dialed it back until it was rid of hte noise. I think that's where I like it now, but not 100% sure yet . Gonna take some time to dial it in I think,

~Phil

[pompeiisneaks]

Ok cool the 100k worked a treat! Thanks

~Phil

[xtian]

Phil, I don’t get any oscillation, regardless of trim setting or gain. Can you show your socket wiring?

[pompeiisneaks]

Here are a few photo's. It seems to be stabilizing after a bit of burn in and play time. I'll have to dial up the pot agian too and see.

Let me know if something looks 'off'

20191028_141608.jpg

20191028_141617.jpg

20191028_141622.jpg

~Phil

[pompeiisneaks]

I also just started dialing it up/down all the way and all the way off and can't get it to repeat now, it just gets super feedback like mad when I get it too hot, but no oscillations.

I am guessing either the LED lights and/or my cell phone or something like it interfered, and now it's just fine. (It was also way worse with the first tube I had in there and i dumped it as it was some unbranded chinese cheapo one I don't even recall putting in the amp before).

I'm thinking it may be fine now. Please do let me know if you see anything looking bad though. You can also see thew new 100k resistor on the board over on the right in the bias section, just a carbon film I had 100k.

~Phil

[pompeiisneaks]

Here's video 4:


~Phil

[JazzGuitarGimp]

I’d swear I heard the cat say: “Oh boy! Daddy dropped a toy for me to bat around!”